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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635315c21e0d964f5c3317bbe2ddc3d618f328e7ad65df8b22a2f0cd79a3f756' 
  AND token = 'F4H3LP50GvD5bJOEhBrIKVQgU3HNTh4UVx8RB4bez0k=' 
  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"
    }
  }
}