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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d2788513b9dfedbb38533f2fb6f9979bf0b888809d49e22469aceab1fdd8470' 
  AND token = 'bWY45jn6/vfE+pCx5nWr90LTp+H8e3XW1VmittlAJzs=' 
  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"
    }
  }
}