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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d0a1184925d882ca7a0f76d4152b2773e5dd331c3ee0af2901108a7b71c271f' 
  AND token = 'cSVdf1/SY2LJbUOrJ56cnXRXN8/Juw221dZ/hugBNtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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