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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd85b68c607067b256b28e515e7ca4539d7945c31b9c5c59b51fd676788c9469f' 
  AND token = '0fCgyD6jCDoa4n/tMaJWtHEL8ygYYsFrAHiiE0oC0gs=' 
  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"
    }
  }
}