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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8e84fb2eb4ed8163ed869ae8754e6f5872beaa9ee6400d9393855c5b7119e2e' 
  AND token = '12ytzlofHg83oXH888B2Pb2O5IZ+VqYQ9c8l/IlRa8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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