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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36bc79f3f73f5980f89f0bba2c007a37a8405ee1d227cd7f27143d2698a23d6' 
  AND token = 'e+nK89CQplzTWeoMKrVTQBvZoln3d3dbL9n9kyztRrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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