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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553cfd31d8690d5a7819b49a572bd50f4c8b72c80a60d8ff817a751a36ff7374' 
  AND token = 'mUqftXNCUCPNTYC/V6e90Czd95X4icOMU+C7j2Yw5c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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