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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5238f1227db39b1d097d099e7b710116b85fe610fc7a8ad6c76d5ac398c5d3' 
  AND token = 'rBCISqSOU0AUr78chXEMENzlrrmQah1rOwRqB2MnY68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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