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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf25b22a0ce19c48ff9f596d360e8e7fdea6db72afbd7416157277094a66c488' 
  AND token = 'zkG4bhzTc2jWIFHG3GMGfnSe/13MKcIh/zyNRwq435g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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