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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be091beb2a08989077d90aad8ed06f4638d07a7748f94ae62aab884184cb4efd' 
  AND token = 'bqaSC/iz5/BzpftU44/rnsHPq49axqPfeKYHC+7haoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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