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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83b2f043cee74b8663a1d75372c6c0b36d109bffdf4640ff79afd4454b9cc14' 
  AND token = 'FUzsh2/kqBNMq73kyYQXfMu9DqHmK1tsmaHPHdt20EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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