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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7ac781e7f6c51c6867ff8f2d208b3ead9f874bfae1b8769fa821546b19ab7b' 
  AND token = 'B9IrcCiIJwQPjHQ4Q0ZG5kIXO7E4E+jNU+2DxOcvSZw=' 
  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"
    }
  }
}