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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5959ab2b2d909a2727e682405b67662423dabb4d7e98d9d50049184ecb49a541' 
  AND token = 'r7dl99r4heemMEl2xzZE3nkfVU8Z82ROM+30WrNim8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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