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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7d500224ed86004dedf94af30a85a7731a58984bfc841eb6bb56483cc6a348' 
  AND token = '8u+N0UAgRs+MOPaR/JnZXfK3RgrcelhvnQTxDyv+CLQ=' 
  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"
    }
  }
}