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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18737f81cb60cc60607cec0322dce7a0017d994011b0f9109b3b8e52c9fdab19' 
  AND token = '+0IlIe+6/iaUCyHfSArMCmsf9uUTUmZwRROXPa+fBlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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