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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c72856aa175d76a5cf05fdad878a4e00b64ffaabb35a468177fe33f01b83b28' 
  AND token = 'r+tib83y5RDER+0EG+rg+/4kI/T/0BMePmjg+xRhfMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}