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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94e4b7ce19cc16eea259c06b3e0ff95ef7cd57b2b67b773ae0aaea265270997' 
  AND token = 'u15WXlV1u6MfmS7sZDXEhlJQPO3g4K/F/uep9T32BZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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