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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c18cbfc9abc988e2e82e6ab40004455a942a6850a3aa58b5af7192387be6ea5' 
  AND token = '65+i6Q/k43SUvPSHIIw+C/yn5F4UK84Eeo2JB0qZlK0=' 
  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"
    }
  }
}