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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025261f7194b5bce7d1328aab607ddc15891b438d5a32986b32bed5e908d31c8' 
  AND token = 'QSl3+5vxODt5wDkK+xKZ2u4bGc2v/nWR9rEVaMWSaIk=' 
  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"
    }
  }
}