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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67702b736ad16ea64de631ca1f59251340c20ce883b3876d97dde641d538f11' 
  AND token = 'JcEWIqyNu+lfXy2fucmgTYqEB+ZEdbx/bSW/xkm7Qls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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