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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c938271e32ea15ea6862600b9b7d110b07d52d7bf69e3e338a2823dddec5c8' 
  AND token = 'F1/YCeg3qioXNlxfxH+TjfuofnB9vAm8pq8Akv92SVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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