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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1a08880278047af9ca2801312b1d50081f6a707ae2f147c3696341db831cd4' 
  AND token = '9HFyZjHfDnIX6TMFM3t1RLebnE8nLz7teNUWx7qyS3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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