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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06272d46a39923b4ebc3b5bb1c8f6a7d7e5655e2f120ae2849f407b7d2371148' 
  AND token = '3PWngwNKSMCN0f+UopwsUQD8mtuD+7E34ycfJT4MtLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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