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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fd3ce6892904a005c3998a53657483270ca97dc3e491e044359f2d97f44314' 
  AND token = 'ATXS1tci30x86RcBijZn3hI2TB6C02UGfc6U9nyqGs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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