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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8587f95d4212cd8dd5ff327401f6e970e285a2df7f4baab7d6b5a513c996cd04' 
  AND token = 'WQq+eGOeSEfGe5HFTEkMWE84m2l0hHpOvs8ilc+UMXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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