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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376b33bd5db57f1fa62c184c9f8435e2766ac319b7cbfd24f5ccb6bbe96b0f98' 
  AND token = 'rY09c97R88PnHWosJgVmYehrD3NNAv8he7ZKr9F1e70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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