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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd07772c9cfcb6dd01040a56ec831798ac227d467d70480d350325ab2b1f97b25' 
  AND token = 'mCxuIunuj4+YcmBHK732vEokOa+nUyhYqxZCFts2Zlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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