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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6614ebd60a4646c529ecf262adbb38b55c608b23ceb4d3f5d15480644366f1' 
  AND token = 'qO8BNanLkA+QVgk7KL3ouof4zQjJN/7DSKbpGP47R2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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