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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e715e6aa3ddbe818b90b25857657cf543f3316673ca6b140dc08d9fe93782e38' 
  AND token = '7m6oBJPDqnBSD+j7Wf9K1iWF1LqH2dZCLqBSZd6Hx3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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