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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878d810b43025249c3ef869b563e501f912c455c84fc0594ea44d8a8d2367d5a' 
  AND token = '3P7RPqq9rlywY02k8Mk74Oc4wJHRZ42MYiDlPE+kh0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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