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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b2cf5eb640bba9409ecf19c10071be99e6bd60df0b8f6680c4726b790a19b7' 
  AND token = 'ttc0aU7xDpGvngZV9qjBnixsQ6sdRDl7IMlF3sFUaEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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