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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aebb87be74d0fc365eda12b9f2cc595f57d8380dea010cfe5e6c093e3717d6d' 
  AND token = 'ub6yedk7kakcXH1tFll3eN3h7uGqRRsWfLRecky4uRM=' 
  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"
    }
  }
}