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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3ee5ea724e1c9d09fb02837ce9dcbbe662c1568898eeef7a992d05fa1397f17' 
  AND token = 'iYiJuimNGWntS1jcTCDU2vOvmNtKT+9hPyr/gj/DxXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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