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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b359a3061d6933d81ad3a7eb2cc85bf3c0eb2e70859e84a8d8f6e971147398' 
  AND token = '3CtXrW6IYhmTY8ZFX/RMvyvmKHkellwLmdnDbcW8Uq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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