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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b58affc8700595ae5fa5ef4dbd0f83f71a0c8713c8a3f8dbacf6bc84fec682' 
  AND token = 'pL6mctbc6z6DoGW8CZmnuhYwgPJyGVc+NqdGsC+KFoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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