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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b6f1e58d2fe3bcf0f88e0b2ec023757f1d7f5ced5ee600c2f679ce2a41846e' 
  AND token = '4SVICObDNByGxeCrPRZxCor96OLPmGrPXPKEROv+uqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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