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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c469d587741e946ec65aac1fd8f24de1be8d80162d48d3eb7840efe90dc1901b' 
  AND token = 'RrbLNGDkk1d8mY6FFCl9x37CgtpMnMUvGq4zy0gaPlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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