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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3489c84c326e8a65e960336b4e4835c2d051e4290867599e41fc8e00fad11538' 
  AND token = 'iZ3upjjWyY76EtlPm0OVJz6338u3jtOMy3vW4NQ9cBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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