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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae437c753b2dac8b5563d40a657e6f50fcf2c265a20dd5ef2177bc24a257c61' 
  AND token = 'i5dMnP9PQ533/Wmr1xXf13sejlUQBDMB0P3FkSLq4L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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