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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17ba9f93c020a284c1394bab9f50efc43a34cb7aae6c853fcaf40a13d94e125' 
  AND token = 'R+PnS+mPMoiZra+usjG8K1bvuyXlBeR7dZ+q4V3/7Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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