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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5ec0294cef7bab5e5397b3c0f9b686800fbd363cf700fc6f006a03e4643554' 
  AND token = 'nWx94N8JACKh2kZXb54A8LOTOKZV1gdMEyOGE4Xqw58=' 
  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"
    }
  }
}