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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1050b7408bcfa35b42c35c600aa2a9a4889a17ac6797b183acb9728d874e4f77' 
  AND token = 'fA+2ycn9X9X3en2ACXdfMvYyhpkgF+j996TgWNRsNgE=' 
  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"
    }
  }
}