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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68348108710ace6355f5fa93c5820b16550493fac3ca6c0c6f5caa9984b83fb8' 
  AND token = 'Km+KRmLlTY0zkpQdmDdlsCI8/Iir6Q6Okfyn+PTxL5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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