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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2f59318224f8739bc6541363fcb0c4150a6ece36a19acfd9961ece91d014573' 
  AND token = 'i9xpaAC31MreFezHwFlmWCnqzWv8+B7R7as6UnLCyng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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