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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd792623a09055a3a02a8069db069e5bd524b022dc48052e581a03738099bd25' 
  AND token = '8Jp9iTbmLhY7PYwazGGPCFd4kC3eDB1Y07d0kJDsuws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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