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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd572c2f5cb99fcc5e1b836002aeb935251507a37de6dc4db681b38f25e7ca48c' 
  AND token = 'j9UIpzQI4l5aExV4zoIuU84wMG3IZomxnzp4wXKaOJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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