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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '905d01e588235af3f4807c7c6a80960bb0ce43ebde6317b5b65d4c883d4e6c2c' 
  AND token = 'HcQ84q7YD4l3eimyarGiw4oP7M1LHQPycHfBCgOltp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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